feat(tests): add ODK configuration file and refactor submission handling

src/backend/tests/.pyodk_config.toml

@@ -0,0 +1,4 @@
+[central]
+base_url = "https://odk.dev.fmtm.hotosm.org/"
+username = "[email protected]"
+password = "odk-central@naxa"

src/backend/tests/conftest.py

@@ -351,18 +351,13 @@ def forms(base_url, auth, pid):
     """
 
     with Client(config_path=odk_config_file) as client:
-        client.submissions.create(
+        submission_data = client.submissions.create(
             project_id=odk_project_id,
             form_id=odk_form_id,
             xml=submission_xml,
             device_id=None,
             encoding="utf-8",
         )
-        submission_data = client.submissions.get(
-            project_id=odk_project_id,
-            form_id=odk_form_id,
-            instance_id=submission_id,
-        )
 
     yield {
         "project": odk_project,